diff --git a/client/src/app/core/ui-services/duration.service.ts b/client/src/app/core/ui-services/duration.service.ts
index 3647f2e1e..0a9fa84fe 100644
--- a/client/src/app/core/ui-services/duration.service.ts
+++ b/client/src/app/core/ui-services/duration.service.ts
@@ -88,10 +88,11 @@ export class DurationService {
      * @returns a more human readable time representation
      */
     public durationToString(duration: number, suffix: 'h' | 'm'): string {
-        const major = Math.floor(duration / 60);
+        const major = duration < 0 ? Math.ceil(duration / 60) : Math.floor(duration / 60);
         const minor = `0${duration % 60}`.slice(-2);
         if (!isNaN(+major) && !isNaN(+minor)) {
-            return `${major}:${minor} ${suffix}`;
+            // converting the number '-0' to string results in '0'
+            return `${major === -0 ? '-' + major : major}:${minor} ${suffix}`;
         } else {
             return '';
         }